Graph 将0,0设置为c3图形中的原点（消除填充）

我正在使用c3生成一个图，我希望得到图的原点为0,0，没有任何填充。使用此代码，我的y轴在直线上（x轴），但在x轴上，0记号标记和y轴之间仍有间隙

我尝试了两种不同的方法，看起来两个轴的填充效果不同。在我的代码中是否有什么东西可以消除X和X左边的所有填充

var chart = c3.generate({
                padding: {
                    top: 4,
                    right: 150,
                    bottom: 4,
                    left: 150,
                },
                data: {
                    x: 'x',
                    columns: [
                                ['x', 0, intersect, intersect, xinterceptd/2, xinterceptd],
                                ['demand curve', yinterceptd, (1*yinterceptd)+(1*demandslope*1*intersect), (1*yinterceptd)+(1*demandslope*1*intersect), yinterceptd/2 , 0],
                                ['supply curve', yintercepts, supplyslope*intersect + (1*yintercepts), supplyslope*intersect + (1*yintercepts), (supplyslope*xinterceptd*1)/2 + (1*yintercepts), supplyslope*xinterceptd + (1*yintercepts)],
                                ['equilibrum price', supplyslope*intersect + (1*yintercepts), supplyslope*intersect + (1*yintercepts), null, null, null],
                                ['equilibrum quantity', null, 0, supplyslope*intersect + (1*yintercepts), null, null]
                    ],
                    regions: {
                        'equilibrum price': [{'style':'dashed'}], 
                        'equilibrum quantity': [{ 'style':'dashed'}]
                }},
                axis: {
                    x: {
                        label: xunits,
                        padding: {left: 0},
                        min: 0
                    },
                    y: {
                        label: yunits, 
                        padding: {bottom: 0},
                        min: 0
                    }
                }
            });
        }

谢谢